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Our  Writing  Fluids. 
J  Am.  Jour.  Pharsc> 
I     Sept.  1, 1872. 
glycerin,  one  grain  of  chromate  of  potash,  previously  dissolved,  andi 
four  grains  of  powdered  gum  arabic. 
INDESTRUCTIBLE  INK  FOR  DEEDS,  AC. 
Dissolve  twenty-five  grains  of  powdered  gum  copal  in  two  hundred' 
grains  of  lavender  oil  by  the  aid  of  a  gentle  heat ;  then  add  two  and 
a  half  grains  of  lamp-black,  and  half  a  grain  of  powdered  indigo. 
Another  for  the  same  purpose  : 
In  eighteen  fluidounces  of  water  boil  shellac,  two  ounces,  and  boraxr 
one  ounce ;  when  cold  filter  and  mix  with  one  ounce  of  gum  arabic 
dissolved  in  two  ounces  of  water,  to  which  add  powdered  indigo  and, 
lamp-black  as  much  as  may  be  required. 
RED  INK 
Is  commonly  prepared  by  boiling  brazil  wood,  two  ounces,  in  thirty- 
two  ounces  of  water,  to  which  add,  after  the  decoction  has  been 
strained,  half  an  ounce  of  chloride  of  tin,  and  one  drachm  of  pow- 
dered gum  arabic  ;  then  evaporate  to  sixteen  fluidounces. 
Or, 
Dissolve  carmine,  one  drachm,  in  half  a  drachm  of  liq.  am  mo  is 
fort.  (sp.  gr.  880),  then  dissolve  twenty  grains  of  powdered  gum- 
arabic  in  three  ounces  of  water,  which  add  to  the  dissolved  carmine. 
BLUE  INK 
May  be  prepared  by  dissolving  two  or  three  ounces  of  sulphate  of  in- 
digo in  a  gallon  of  water  ;  or  by  rubbing  together  one  ounce  of  oxalie 
acid,  and  two  ounces  of  fine  Prussian  blue,  to  which  add  one  quart  of 
boiling  water. 
INK  POWDER 
May  be  prepared  by  mixing — 
Powdered  galls,  four  ounces, 
Powdered  sulphate  of  iron,  one  ounce, 
Powdered  gum  arabic,  one  ounce, 
Powdered  white  sugar,  half  an  ounce, 
Powdered  cloves,  one  drachm. 
To  these  proportions  add  of  water  one  quart,  and  macerate  for  an 
hour  or  two. 
Note :  the  quantity  of  sulphate  of  iron  is  small  because  it  has  been 
dried,  and  has  thus  lost  the  weight  of  water  evaporated. 
